The Japanese would have annihilated the British without the US, just look at what they did when fighting the US:
https://en.wikipedia.org/wiki/Indian_Ocean_raid
Japan doesn’t need India-they just need the Dutch East Indies. If that is achieved, hopefully the British would sue for peace. That’s hoe Japan wins the war.
Japan could have blockaded Australia as mentioned above, but without American intervention it probably will not have been needed.